Age and Reproduction in Savannah Sparrows and Tree Swallows
Age and Reproduction in Savannah Sparrows and Tree Swallows
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萨凡纳麻雀和树燕的年龄和繁殖
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
C. Schultz
中科院分区：
文献类型：
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作者：
N. T. Wheelwright;C. Schultz
1.与年长的女性相比，1岁的萨凡纳麻雀（Passerculus pallichensis）和树燕（Tachycineta bicolor），研究了七个繁殖季节的肯特岛，新玩法，加拿大，产卵晚于本赛季，有较小的离合器，并产生较少的存活后代。2.为了确定为什么幼鸟的繁殖成功率低于年长的鸟类，我们诱导不同年龄的鸟类在相同的条件下通过在模拟巢捕食的实验中去除离合器来更换离合器。3.在这两个物种中，一岁鸽产生的蛋大小与年长的雌鸽相似，因为它们在第一和第二窝中每窝产的蛋都比年长的鸟少
1. Compared to older females, 1-year-old Savannah sparrows (Passerculus sandwichensis) and tree swallows (Tachycineta bicolor), studied over seven breeding seasons on Kent Island, New Brunswick, Canada, laid eggs later in the season, had smaller clutches, and produced fewer surviving offspring. 2. To determine why young birds have lower reproductive success than older birds, we induced birds of different ages to replace clutches under the same conditions by removing clutches in an experiment simulating nest predation. 3. In both species, yearlings produced eggs similar in size to those of older demales, by they laid fewer eggs per clutch in both first an replacement clutches than older birds